Improvement in fire-alarm telegraphs



N0.l53,958. l Patented Aug.11,1874.

' WVQM.

UNITED VS'rnrus J`P.A:ria.Nfr AQFFIo-E.

AMos HoLBnooK, or LYNN, MASSACHUSETTS.

IMPROVEMENT, IN FIRE-ALARM TLEGRAPHS.

Specification forming part of Letters Patent No. `153.958., dated August 11, 1874; application filed December 3,. 1873.

To all whom it may concern: y

Be it known that I, AMos HoLBRooK, of

Lynn, in the county of Essex and State of Massachusetts, have invented a certain new and useful Signal-Indicator for Fire-Alarms, of which the following is a specification:

My invention relates to a device by which I` cause two or more pointers and dials to indicate the number of the district which is being struck by the electric re-alarm.

The nature of my invention consists in combining with the device through which the motion of the pointers is governed a timer, said timer being so arranged that when a signal is` received, which starts the pointer, it starts an` tion of the timer will throw the detent'tripper` out of connection with either detent, so that, though the signal be received by the device at the next roundthat is, after aninterval of twenty seconds-there will be no further movement of the pointers on the dials, as their let-oli' detents are no longer acted upon.

Figure lis an elevation of my device. Fig. 2 is a horizontal section through a part of the same. Fig. 3 is a vertical section taken on the line w y of Fig. 1.

Let A represent the base or frame, to which I attach the other parts of my invention. D1 is a notched wheel, upon the axle of which I attach a pointer, D1. This pointer moves over the face of the dial. (Not shown in the drawings.) The notches in the wheel D1 are arranged as shown, so that if the lever D is depressed the wheel will be free to revolve. The lever D, when depressed by the action of the magnet, which will be hereafter explained, returns quickly to place, so that the dial-wheel D1 can only move one notch, of course carrying the pointer D1 but one division of the dial. The dial-wheel E1, pointer E2, and lever E are arranged similarly to the device D1 D2 D, al-

ready described. Motion is given lto-thedialwheels by the weights D3 E3. Each of the dial-wheels is also provided with a retarding device, which serves to prevent a too quick motion when released. B is a rod, which is actuated by an electromagnet, through which a current is passed at the instant asignal :is given. This rod B connects with thebentlea ver B1,which is pivoted at B2. VThe upper end bent, as shown at dand e. This quill G1 is free to rock and slide on thestud G2, but is held in position by the spring G5, Fig. 2. L is a gear-wheel operated by a clock-movement, regulated so'as to` give it a xed velocity. N

`is the regulator ily-wheel, and held from revolving by the hook N, which is connected, by the rod M, to the lever B1, as shown. M1

is a latch connected to the hook N, so as to swing with it i about the center n. M2 is a spring, which presses against the latch M1. M3 is a second latch, pressed up by a spring,

M71. This latch moves up and holds the latch M1 and the hook N when the same have been 4drawn back by the rod M. F1 is a segmentgear, hung at F2 to the swinging arm F1, which is pivoted on This segment-gear F1 is hung, as described, on a swinging arm, so that it may be forced out of connection with the wheel L. This is `eiect'ed by means of the link B3, which is attached to the bent lever B1, so that whenever B1 is pulled back the segmentgear F7 is freed from the wheel L, and drops until-stopped by thegage-screw P. K is an incline, against which the pin K contacts Whenever the segment-gear F7 is raised high enough. The action of this incline on the .pin K forces the segment-gear F7 back out of contact with the gear L, so that, though L continues to revolve, it cannot raise F'I any higher. F8 is a spring. acting against the swing F1, and serves to push the segment-gear F1 toward the gear L. F6,Figs. l and 3, is an incline, attached to the segment-gear F1, and arranged as shown in Fig. 3, so as to act, through the lever F4, upon the thimble G4, and through it upon the arm O3, Fig. l. Inspection of Fig. 3 will show that, as the segment-gear F7 rises, it will carry up the incline F6, which, acting upon the lever F, carries back the sleeve C* and arm O3. As the movement of this incline F6 is timed by clockwork, it is evident that the movement of the sleeve C4 and arm O3 will also be timed, so that, if F'I be allowed to rise a certain'number of seconds, the arm G3 will begin to move over the bent part d, Fig. 2, of the let-oli' lever D. If more time is allowed, the arm C will extend over the part e of the let-off lever E. If still more time is allowed, the arm C3 will pass beyond e onto the rest Q. H is a drop-lever, arranged so that the spring H3 will press against the sleeve C4, as shown in Fig. 3. As soon as the sleeve G4 is pressed in, so that its arm C3 has passed beyond d, Fig. 2, the lever H will drop below the shoulder G5, Fig. 3,'fof'vthe sleeve C4, and thus prevent it from springing.

back when released from the lever F4. As soon as this sleeve C4 has passed beyond e, Fig. 2, then H willl dropover the endl of the sleeve G4, and -prevent it from coming baci when released. l

The operation of my device is as follows: The weights L D3 E3 are wound up, the hook yN engaging with the fly N1, so as to prevent the movement of the clock-work. The segment F" is allowed to drop to its lowest point, as shown in Fig. -15 the lever H is raised, as shown in Fig..1, so as to allowthe sleeve O4 to take the position represented in Fig. 2, so that its arm C3 rests over the bent part d of the let-oft' lever D. Now, when a signal is received, the magnet, acting on the wire B,draws back the lever B4, and, acting through G1, the

sleeve G4, and armrCS, depresses the let-oli' lever D; this allows the dial-wh eel D1 to revolve one notch, so that the hand D2 willpoint to I on the first dial. At the same time this is going on, the rod M releases the clock-work, and the segment F7 begins to ascend, carrying with it the incline F6, which, acting through the lever F4, pushes the arm C3 toward E, Fig. 2. If this motion is only allowed to continue for two or three seconds, then Vthe next stroke oi the signal will again act, as before, on the le ver D, and the first dial-hand D2 will point to figure 2 of the dial. Now, if an interval of six or seven seconds be allowed, as would be in case the alarm came from box twenty odd, then the arm G3 will have passed over to the bent end e of the lever E. In the meantime the lever H will drop in front of the shoulder G5, Fig. 3, and prevent the sleeve C4 from springing back, and carrying the arm G3 overD again then the next stroke of the signal will be recorded by the pointer E2 of the second dial, and the number will be read as 21; or, if another stroke is given within two or three seconds, the pointer E will go to figure 2 of the second dial, and the record will be 22. If this is the true number no other stroke will be given for about twenty seconds, in which time the action of the clock-workthroughF, F4, and G4, will carry-the arm C3 beyond E, Fig. 2, over the rest Q, andin the meantime the lever H will have dropped down in front of the sleeve C4, so it-'cannot slip back, and the stroke given in repeating the signal will have no effect upon either dial, as the arm G3 will touch neither the levers D or E.

I claim as myinventionl. The combination of sign alindicatin g dials and the detent let-off device G3 G4 C2 with the lever F4, incline F6, and segment-gear F7, operatin g substantially as described, and for the purpose set forth.

2. VThe combination of the segment-gear F" and incline FG with the sleeve C4 and arm G3, operating substantially as described, and for the purpose set forth.

3. The combination of the lever H with the sleeve O4, operating substantially as described, and for the purpose set forth.

VAMOS HOLBROOK.

`Witnesses: v

FRANK G. PARKER, WILLIAM EDsoN. 

